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Succinoylation of wheat straw hemicelluloses in N,N-dimethylformamide/lithium chloride systems

✍ Scribed by Runcang Sun; X F Sun; F Y Zhang

Book ID
104528795
Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
170 KB
Volume
50
Category
Article
ISSN
0959-8103

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✦ Synopsis

Abstract

The chemical modification of native wheat straw hemicelluloses with succinic anhydride using N,N‐dimethylformamide/lithium chloride system as solvent and pyridine and/or 4‐dimethyaminopyridine as catalyst has been examined. In particular, the progress of the succinoylation reaction is studied as a function of the molar ratio of succinic anhydride/anhydroxylose unit in native hemicelluloses from 1:1 to 5:1, DMAP concentration 0.025–0.20 g, reaction temperature 40–140 °C, and reaction time 2–12 h with succinic anhydride. The degree of substitution of succinylated hemicelluloses ranges between 0.4 and 1.5 depending on the experimental conditions. FTIR and ^1^H NMR spectroscopic characterization of the esterified polymers indicates a monoester substitution. The thermal stability of the esterified polymer decreases slightly upon chemical modification, but no significant further decrease in thermal stability is observed for DS ≥ 0.7.

© 2001 Society of Chemical Industry

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Esterification of wheat straw hemicellul
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## Abstract The reaction of wheat straw hemicelluloses with succinic anhydride in aqueous alkaline systems was studied. The products showed a rather low degree of substitution, ranging from 0.017 to 0.21. The effects of reaction times of 0.5–16 h, temperatures of 25–45°C, and molar ratios of succin